Steam-generator.



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Patenten nec. I6, |9u2 J. H.cAMPBELL.

STEAM GENERATOR.

(Appumion med Dc. 1e, 1901.)

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WLTWESSES.

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JOHN H. CAMPBELL, OF DETROIT, MICHIGAN.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 716,187, dated December 16, 1902.

A I Application led December 16, `19.01.l Serial No. 86,050. (No model.)

To `a/ZZ whom, if; may con/cern:

Be it known that I, JOHN H. CAMPBELL, a

citizen of the United States, residing at Detroit, in the county of Wayne, State of Michigan, have invented certain new and useful Improvements in Steam-Generators and I do declare the following to be a full, clear, -and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same,fref erence being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

This invention relates to a steam-generator; and it consists in the construction and arrangement of parts hereinafter fully set forth, and pointed out particularly in the claims.

The objects of the invention are to produce a steam-generator of` comparatively simple vand inexpensive construction in which the arrangement is suchv as to providea rapid and constant circulation of waterthroughout the entire boiler, so as to maintain all parts at a uniform temperature; to provide amply for expansion and contraction, so that no jointsv are effected by any change of temperature and a rupture of anyof the pipes is obviated; to provide for an ample supply of water: to the steam-generating coils, so as to obviate the possibility of the coils becoming dry and burning out;l to provide Aa mud-pipe which receives the impurities depositedfrom the water, sopositioned as to be free from the action of the iire, and to maintain a uniform temperature of thefwaterin the generatingcoils, so as to relieve the boiler from the destructive strain Vdue to unequal expansion.

The above objects are attained by the structure illustrated in `the Vaccompanying drawings, in which` Figure lisa perspective view of my improved boiler with the casing removed. Fig. 2 is a vertical central section through the boiler and casing, the steam and water dome appearing in elevation and a portion of said dome being broken away to show connection 0f steam-coils therewith. Fig. 3 is a horizontal section through the boiler as on line 3 3V `ofFig.-2. Fig. 4 is a plan view of a baffleplate located between the generating-coils and the top of the casing. 4

Referring to the characters of reference, l designates the mud-pipe, consisting of the parallel side sections connected by the transverse section at the rear. The grate .2 is supported between the side sections of the mudpipe upon the transverse bars 3, whose ends are in turn supported in the brickwork of the casing. Located at either side of the firespace are the side coils 4, comprising a series of connected loops. The lower ends of said coils are connected by means of the fittings 5 with the side sections of the mudpipe, while the upper ends of said coils are connected by the short pipe-sections 6 with the upper portion of the steam and Water dome 7. Said side coils are also connected with the bottom of said dome by means of the lateral pipes S, leading from the T-couplings 9.

Interposed between the side coils 4 is a series of coils l0, located above the tire-space and around which the products of combustion pass. These coils 10 are connected at their lower ends with the bottom of the dome 7 through the lower cap ll of said dome, as shown in Figs. 2 and 3, and with the top of the dome by the elbows l2, as shown in Figs. l and 2, by which arrangement each individual coil is separately connected tot the dome at its opposite ends, the lower ends of said coils communicating with the water-space of the dome and the upper ends of said coils communicating with the steam-space. As the dome is lled with waterto a point below the entrance of the upper ends of the coils therein, a constant and full supply of Water is at all times furnished to said coils so that no matter how rapid the circulation therethrough nor what amount of steam is being generated therein said coils can never become dry through the exhaustion of water therefrom. At the same time the circulation `of Water through said coils is so rapid as to prevent the accumulation of sediment. The upper end of the dome 7 affords a space for the steam, and leading from the cap 13 thereof is a steam-pipe 14, which is connected with the heat-ing system. The return-pipe from the IOO heating or circulatory system is indicated at 15 and is connected at its lower end `through a fitting 16 with the mud-pipe. Communicating with the bottom of the dome is a threeway fitting 17, from which lead the side pipes 18, that connect at their lower ends with the opposite side sections of the mud-pipe, and the rearwardly and downwardly extending pipe 19, which communicates at its lower end with the rear section of said mud-pipe. This arrangement maintains a full supply of water in the mud-pipe and at the same time affords a free passage for the sediment from the dome.

It will be observed that all of the coils of the generator communicate at one `end with the water of the dome and at the other end with the steam-space thereof, whereby the water in all of said coils is of uniform temperature, thereby obviating unequal expansion, relieving the boiler from the strain incident thereto. By maintaining the water in all of the coils at an even temperature the cooling of the water in any part of the boiler is obviated, and the, generating of the steam is not interfered with by the introduction into the circulation of water at a low temperature from some part of the boiler remote from the heating-space, as is common in many watertube boilers.

The boiler is inclosed in a suitable casing 20, (illustrated in Fig. 2,) preferably of brick, and crossing the rear of the fire-space is a bridge-wall 21, which prevents the caloric current from passing to the rear and directs it upwardly through the coils above the firespace and around the dome. Crossing the top of the case transversely is a baffle-plate 22, which embraces the dome and stands at a short distance above the coils. Said plate is provided at its two front corners with draftopenings 23 and with a semicircular opening 24 around the dome, through which the elbow connections of said coils extend and which also aords a passage from the draft. This baffle-plate serves to prevent a too-rapidY passage of the caloric current through the boiler and causes it to become distributed more evenlythroughoutthe heating-space. Above the baffle-plate is a chamber 25, and communicating with said chamber is an opening 26, which leads to the stack.

A water-column 27 is provided, which is connected through the pipe-section 28 with the mud-pipe and by the pipe-section 29 with the steam-pipe 14. A steam-gage 30 is also connected with the pipe 29, as well as a safetyvalve 3l, which parts may be of any suitable construction.

It will be observed that there is considerable steam-space 32 within the upper end of the dome above the point of entrance of the generating coils therein, so that a steamchamber is formed of such area and of such height above the water as to prevent the entrance of the water into the pipe of the circulatory system with the steam which passes therethrough.

Below the grate is a suitable ash-pit 33, to which access is afforded through the door 34.

The Stoke-door is indicated at 35, through which fuel is supplied to the combustionchamber. Above the Stoke-door is a large door 36, affording access to the steam-generating coils for the purpose of cleaning them from any accumulation of soot.

The system may be fed by introducing water into the return-pipe 15 or into the pipes of the heating system at any suitable point.

Having thus fully set forth my invention, what I claim as new, and desire to secure by Letters Patent, isl l. In a steam-generator, the combination of a steam and water dome, a mud-pipe connected therewith, a series of steam-generating coils comprising united horizontal pipe-sec tions arranged side by side and communicating at their lower ends with the water-space ot' said dome and at their upper ends with the steam-space thereof, all of said coils having independent and equal access to the water-supply and equally free communication with the steam-space of the dome.

2. In asteam-generator, the combination of a 4steam and water dome, a mud-pipe, side coils communicating at their lower ends with the mud-pipe and at their upper ends with the steam-space of said dome, said side coils also communicating with the water-space of said dome, a series of steam-generating coils consisting of horizontal and vertical pipes united by bends at their ends interposed between said side coils,all of which com'municate independently with the water-space of said dome at their lower ends and with the steamspace of said dome at their upper ends and a pipe, connecting the lower end of said dome with said mud-pipe.

3. In a steam-generator, the combination of a steam and water dome, a series of coils comprising a plurality of vertical loops arranged side by side and composed of united horizontal pipe-sections, said coils communicating at their lower ends with the water-space of said dome and at their upper ends with the steamspace therein, each of said coils having free and independent communication with the dome at its opposite ends, the steam-space of `said dome rising above the point of entrance of the upper ends of the coils therein, a grate and tire-space below said coils and means for directing the caloric current around said coils and dome in its passage to the stack.

- 4. In asteam-generator, the combination of a dome, a mud-pipe comprising parallel side sections and a transverse rear section connecting said side sections, the pipes connecting said side sections and said rear section of the mud pipe with the bottom of said dome, side coils communicating at their lower ends with the mud-pipe, at their upper ends IOO IIO

with the upper end of the dome and having l a pipe connection with the bottom `of the dome, a grate Within the area described by the mud-pipe, a series of steam-generating coils consisting of horizontal and vertical pipes united by bends at theirends located between said side coils above said grate, each of said steam-generating coils having independent communication with the bottom of to the dome at their lower ends and a like com- I munication with the top of the dome at their upper ends and a suitable casing embracing said 'coils and dome.

In testimony whereof I sign this specification in the presence of two witnesses.

JOHN H. CAMPBELL.

Witnesses:

MATHEW M. KEER, E. S. WHEELER. 

